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Financial instruments - Additional Information (Detail) | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 30, 2020 USD ($) termLoanFacility derivativeContract | Dec. 31, 2021 USD ($) $ / MWh | Dec. 31, 2021 USD ($) $ / MWh | Dec. 31, 2020 USD ($) | Dec. 31, 2021 CAD ($) $ / MWh | Apr. 09, 2021 CAD ($) | Feb. 15, 2021 CAD ($) | Dec. 31, 2020 CAD ($) | Sep. 30, 2019 USD ($) | May 23, 2019 USD ($)
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Number of term loan facilities | termLoanFacility | 2 |  |  |  |  |  |  |  |  |
Foreign currency gain (loss) |  |  | $ (30,270,000) | $ 28,406,000 |  |  |  |  |  |
Revenue collection period |  |  | 45 days |  |  |  |  |  |  |
Accounts receivable |  | $ 422,752,000 | $ 422,752,000 |  |  |  |  |  |  |
Cash on hand |  | 125,157,000 | 125,157,000 |  |  |  |  |  |  |
Available to be drawn on senior debt facilities |  | 1,826,256,000 | 1,826,256,000 |  |  |  |  |  |  |
Liberty Power Group |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Foreign currency gain (loss) |  |  | 7,824,000 | 18,875,000 |  |  |  |  |  |
Non-regulated Energy Sales |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Unrealized gains (loss) in AOCI to be reclassified |  |  | (1,843,000) |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Unrealized gains (loss) in AOCI to be reclassified |  |  | (1,555,000) |  |  |  |  |  |  |
Derivative gains |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Unrealized gains (loss) in AOCI to be reclassified |  |  | 1,206,000 |  |  |  |  |  |  |
Senior Unsecured Notes | U.S. dollar Subordinated unsecured notes |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Par value |  | 637,500,000 | 637,500,000 |  |  |  |  |  |  | $ 350,000,000
Senior Unsecured Notes | Canadian dollar Senior unsecured notes |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Par value |  |  |  |  | $ 1,400,669,000 | $ 400,000,000 | $ 150,000,000 |  |  |
Interest rate swaps designated as a hedge | U.S. dollar Subordinated unsecured notes |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative notional amount |  |  |  |  |  |  |  |  | $ 350,000,000 |
Currency Swap |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative notional amount |  |  |  |  | $ 500,000,000 |  |  | $ 650,000 |  |
Foreign currency gain (loss) |  |  | 4,232,000 | 13,256,000 |  |  |  |  |  |
Currency Swap | Senior Unsecured Notes | Canadian dollar Senior unsecured notes |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Foreign currency gain (loss) |  | $ 1,925,000 |  |  |  |  |  |  |  |
Foreign exchange contract |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Foreign currency gain (loss) |  |  | (1,595,000) | 3,581,000 |  |  |  |  |  |
Currency forward contract |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Foreign currency gain on settlement of derivative |  |  | 2,329,000 | 2,363,000 |  |  |  |  |  |
Ascendant |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Number of interest rate swaps redesignated as cash flow hedges | derivativeContract | 2 |  |  |  |  |  |  |  |  |
Ascendant | Interest Rate Swap One |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative notional amount | $ 87,627,000 |  |  |  |  |  |  |  |  |
Derivative, fixed interest rate (percent) | 3.28% |  |  |  |  |  |  |  |  |
Ascendant | Interest Rate Swap Two |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative notional amount | $ 8,875,000 |  |  |  |  |  |  |  |  |
Derivative, fixed interest rate (percent) | 3.02% |  |  |  |  |  |  |  |  |
Canadian Investments and Subsidiaries |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Foreign currency gain (loss) |  |  | $ 168,000 | $ 656,000 |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Forward price | $ / MWh |  | 19.76 | 19.76 |  | 19.76 |  |  |  |  |
Minimum | AYES Canada | Measurement Input, Discount Rate |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Alternative investment, measurement input (percent) |  | 0.0775 | 0.0775 |  | 0.0775 |  |  |  |  |
Minimum | Atlantica Yield Energy Solutions Canada, Inc | Measurement Input, Price Volatility |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Alternative investment, measurement input (percent) |  | 0.2549 | 0.2549 |  | 0.2549 |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Forward price | $ / MWh |  | 130.85 | 130.85 |  | 130.85 |  |  |  |  |
Maximum | AYES Canada | Measurement Input, Discount Rate |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Alternative investment, measurement input (percent) |  | 0.0825 | 0.0825 |  | 0.0825 |  |  |  |  |
Maximum | Atlantica Yield Energy Solutions Canada, Inc | Measurement Input, Price Volatility |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Alternative investment, measurement input (percent) |  | 0.3716 | 0.3716 |  | 0.3716 |  |  |  |  |
Weighted Average |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Forward price | $ / MWh |  | 32.51 | 32.51 |  | 32.51 |  |  |  |  |
Weighted Average | AYES Canada | Measurement Input, Discount Rate |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Alternative investment, measurement input (percent) |  | 0.0814 | 0.0814 |  | 0.0814 |  |  |  |  |

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